did you try to reboot in safe mode and log in with the local administrator account, if the local admin account is disabled it should be enabled when rebooted into safe mode. you could also run DART if you have SA it is part of the desktop optimization
pack it has an tool to rest the local administrator account.

There are couple of tools you could use to clear the local Admin PW, here is one that I like

http://home.eunet.no/~pnordahl/ntpasswd/

if that link doesn't work just do a quick search for "Offline NT password & registry editor" and it should give a place that you can download it.

One of the reasons I like this tool is that it can be used to unlock and enable the local Admin account as well as set/clear the PW. Hopefully the GPO just disabled local admin account or at least didn't delete ALL the local accounts, if thats the case you
should be able to just enable the account, clear/set the password, and then login with the account.

I'm not real sure but you MIGHT (VERY BIG MIGHT) be able to use something like the "net user" cmd

here is a you tube clip that might help as well. but again I'm not so sure about this: http://www.youtube.com/watch?v=QOx6dI0grow

did you try to reboot in safe mode and log in with the local administrator account, if the local admin account is disabled it should be enabled when rebooted into safe mode. you could also run DART if you have SA it is part of the desktop optimization
pack it has an tool to rest the local administrator account.

There are couple of tools you could use to clear the local Admin PW, here is one that I like

http://home.eunet.no/~pnordahl/ntpasswd/

if that link doesn't work just do a quick search for "Offline NT password & registry editor" and it should give a place that you can download it.

One of the reasons I like this tool is that it can be used to unlock and enable the local Admin account as well as set/clear the PW. Hopefully the GPO just disabled local admin account or at least didn't delete ALL the local accounts, if thats the case you
should be able to just enable the account, clear/set the password, and then login with the account.

I'm not real sure but you MIGHT (VERY BIG MIGHT) be able to use something like the "net user" cmd

here is a you tube clip that might help as well. but again I'm not so sure about this: http://www.youtube.com/watch?v=QOx6dI0grow

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